Portable electric grinding and polishing lathe



E. PORTER. V PORTABLE ELECTRIC GRINDING AND POLISHING LATHE. APPLICATIONFILED JUNE 20/1919.

1 ,326,091 I Patented Dec. 23,1919.

3 SHEETS5HEET I.

E. PORTER. PORTABLE ELECTRIC GRINDING AND POLISHING LATHE.

APPLICATION FILED JUNE 20. 1919.

1,326;,091 Patented Dec. 23,1919.

3 SHEETS-SHEET 2.

[-1. PORTER.

PORTABLE ELECTRIC GRINDING AND POLISHING LATHE. I APPLICATION FILED JUNE20, 1919. 1,326,091 Patented'Dec. 23,1919.

3 SHEETS-SHEET 3.

. y /0 llllll/ UNITED sm es ATENnoFFIoE.

EDWARD PORTER, O1 PERRY, FIlZORIDA, ASSIG-NOR OF ONE-HALF TO JAMES L.WEEKS,

I OF PERRY, FLORIDA.

ron'ranm ELECTRIC GRINDING AND POLISHING LATHE.

Specification of Letters Itatent.

Patented Dec. 23, 1919.

Application filed June 20, 1919. Serial in. 305,578.

To all whom it may concern:

Be it known that I, EDWARD Roam, a citizen of the United States,residlng at Perry, in the county of Taylor and State of Florida, haveinvented certain new and useful Improvements in Portable ElectricGrinding and Polishing Lathes, of which the following is aspecification.

motor for revolving the machine during a grinding and polishingoperation by suitable grinding and polishing wheels, or other devicescapable of being applied to and ,operated by the machine.

A further object of the Invention is to provide a portable machineadapted to be a plied to inner and outer curved surfaces of crank pins,cylinders and the like for truing the same by rotating suitableimplements during the revolution of the machine either upon the insideor. outside of the art1 cle or device, against which such implements areoperated. v

A still further object of the invention is to provide a portable motormachine hav ing planetary motion, and comprising novel and peculiarmeans or devices of simple character for applying the machine to variouscurved surfaces for grinding, truing and polishing such surfaces.

Various other objects, advantages and improved results are attainable byreason of the construction, operation and adaptability of the machine,as will be hereinafter fully described.

In the accompanying drawings forming part of this application:

Figure 1 is an end view showing the application of the invention to acrank shaft pln Fig. 2 is a side elevation showing the same application.

Fi 3 is a longitudinal sectional view showing the application of themachine 1 Without t motor! my machine,

Fig. 4 is a detail sectional view taken on the line 4-4 Fig. 3. 1 Fig. 5is a detail perspective view of the coupling oke.

Fig. 6 1s a detail perspective view of the coupling member havingflanges for sus pending a counterbalance and'for mounting a motor. I

Fig. 7 is a sectional view showing the application of the machine to acylinder.

Fig. 8 is a sectional view of automobile cylinders showing theapplication of this invention thereto.

-The same reference characters denote the same parts throughout theseveral views of the drawings.

I am aware of the various apparatus and machines intended for the samepurposes as but such apparatus and machines embody many features,inconveniences and expense of the same which are avoidable in and bymymachine, and such machines have been found to be incapable of suchuniversal application and results as are attainable in and by mymachine, as will be hereinafter disclosed.

In carrying out my invention I emplo a central shaft or rod 1, oneend ofwhich is screw-threaded to fit the usual screw socket 2 in the pin 3 ofa crank shaft 4 and other similar devices, such as cross head p ns andthe like, a be trued by rindin and polishing. The other end oft e sha tor rod l-has a square screw-thread and an ordinary thread for a nut 5.Said shaft or rod and nut afford means for attaching the various membersor parts of the machine to the article to be ground, as will now beexplained. After the rod 1 has been attached to the article to beground, as the p1n 3, a mounting or foundation member 6, havmg a centrallongitudinal bore 7 for the rod '1, is secured against the face of thepin 3 by the nut 5 The mounting 6 has a key-way 8 for a key 9 on theinner periphery of a gear wheel 10 slidable lengthwise on the member 6,and said wheel is provided with flanges forming anannularly grooved hub11, for a pair of prongs 12 of a coupling yoke 13. A split sleeve 14having suitable clamping bolts, is slidably mounted on the member 6, andthe yoke is bolted to the and the yoke are connected so as to slide inunison on the member 6 during the revolution of these elements in agrinding or polishing operation. The head 18 of the "yoke is slidableover the square thread of stud is held in raised position.

the rod 1 during said revolution only when the yoke stud 19 is in meshwith said'thread. The stud 19 works through and is controlled by aspiral spring 20 having one end abuttin against the upper wall 21 of apocket 22 1n the yoke head, and the other end Works against the enlargedend or flange 23 of the stud which has head grooves 24 for meshing withribs 25'on the yoke head 18. The function of the spring is to keep thestud in mesh with the square thread of the rod 1, until the stud islifted by pulling it out of mesh and turning it so that the stud grooveswill engage the ribs 25 crosswise, whereby the Obviously by turning thestud so that the grooves and rlbs will mesh, the spring 20 pulls thestud into mesh with the rod screw.

The base of the motor 26 is bolted to the V naled in bearings 32 of thesleeve 14' and having a worm 33 meshing with the ear wheel 10, forrevolving the whole mac ine on'the fixed shaft or rod 1, during rotarymovement of'a grinding, or polishing wheel by the motor, andduringlongitudinal move ment of the whole machine when the stud 19 -1s inmesh. with the square thread of the rod or shaft 1., r

The motor is supplied with'elect'ric current by wires 34 attachedthereto and carried by the yoke 13, and by a pair of split -,colleeto.rings 35 loosely clamped to an annular'fiange 36 of the yoke head 18.In order to counterbalance the machine I .attach an arm 1 to a flange'16 projecting from the sleeve 14, and provide said arm with a weight 3*adjustable thereon. Obviously this arm may be shorter and the weightheavien. if necessary to permit the operation of the machine withrespect to certain devices or work, especially with respect-to cylinderswherein the machine is operated. It will be observedthat the rod orshaft 1, is used for. anchoring or attachmg and centralizing the machinewith respect to the article to be ground, and also afi'ords means forfeeding the machine transversely during its revolution, and duringrotary movement of the motor which revolves and feeds the machine. 7 7

Referring toFig. 7, the machine is shown as applied to a steam enginecylinder 37 i for n rinding and polishing the inner periphery filereof,and in order to make such application, I secure the ends of a spanner 38to oneend of the cylinder, and provide the spider head 39 with a tubularextension 40 through which the shaft 41 extends and by means of whichsaid shaft is centralized relative to the cylinder 31. The'projectingends of the shaft 41 may be journaled in suit-- able supports, and thewhole machine, as hereinbefore described, may be operated within thiscylinder for grinding, and polishin the inner Wall thereof.

. Referring to Fig. 8 of the drawings, the same machine in its entiretymay be applied to automobile head cylinders 42 by means of a frame 43adapted to bebolted tothe face of the c linders, and mounting the motor44 on the rame 43 so as to be shifted from one to another of thecylinders for grinding and truing them. Obviously there must be alengthened or longer motor shaft 45 for this application of the machine,and suficient .space is provided between the face of the cylinders andthe frame 43 to permit the grinding wheel to be slid, in said shiftingof the machine, from one cylinder to another without removin the' motoror its shaft until all the cylinders are ground, whereupon the frame 43is readily detached and removed.

Obviously the. compactness of the machine is of great advantage intransportation and application either for outside or inside grinding andpolishing. The machine is self feeding lengthwise during simultaneousrevolution thereof, and of the grinding wheel at a greater velocity thantherevolution of the machine, and the machine is not limited in itsapplications as herein shown and described, but may be used for grindingand truing rocker arm pins of the well known Corliss engines, cross headpins of various engines, valves, and valve bonnets. Therefore I do notwish to be understood as limiting myself in these respects, nor to anyparticular material and size in the manufacture and practicalapplication of the invention, nor to any particular vertical feed formotor or any particular reducing gearing, but reserve the right to makesuch changes and variations therein and in the. combination of thevarious parts of the machine as may not be inconsistent with theappended claims.

Having thus described my invention What I claim as new and desire tosecure by Letters Patent is:

1. In a grinding machine of the character described, a foundationmember, anon-revoluble screw shaft. upon which said member is looselymounted, said shaft adapted to be attached to the article to be ground,

a motor slidably mounted on and geared it, and an adjustable feed deviceco'nnecte with the motor and adapted to mesh with the said screw shaftfor sliding the motor during the joint revolution of the motor and thefoundation member; '2

2. In a grinding machine of the character described, a fixed shafthaving a screw. feedportion, av foundation cylinder loosely.

mounted on the shaft; whereby one end of the cylinder is made toengagethe' article.-

to be ground and the other-end forms the only bearing between thecylinder and the shaft for the purpose of alinement with respect to sucharticle, a motor slidable on and geared with the cylinder, and a feeddevice connected with the motor and meshingwith the said screw portionfor sliding the motor during the joint revolution of the motor and thecylinder; 7

7 described, a foundation member, a fixed shaftupon which said member ismounted and having a feed screw a gear .wheel slidg ably keyed onsaidmem er, a yoke having a head revoluble on said shaft and engaging" thewheel hub, a stud adjustable the yoke head for meshing with said screw,9. motor o I Witnesses:

connecting the motor with the yoke for feedgearing connecting the motorwith said wheel; j

' 4. In a grinding machine of the character described, a foundationmember, a fixed shaft upon which said member is mounted and having afeed. screw, a gear wheel slidably keyed on said member, a yoke having ahead revoluble on said shaft and engaging the wheel hub, a studadjustable in the yoke head for meshing with said screw, a sleeve" onthe foundatlon member and attachedrto the yoke, a motor mounted on thesleeve and geared with said wheel for revolving the foundation m ember,the sleeve rotated by the motor during the revolution y -1 of thefoundation member and'during trans- 3. I'n-a grinding machine of thecharacter verse feeding of the yoke and the motor.

In *witness whereof I hereunto set my hand in the-presenceoftwowitnesses. I EDWARD POBTER.

F.-M. Sm'rri, "J; Scams,

'ing the motor transversely, and a reducing

